I was hoping someone with first hand experience can tune in (punny right) on this subject or also someone who has read up on this. I was wondering how much of a difference tuning on 93 octane, as opposed to 87, actually makes. I'm not going to be doing any mods that require tuning for a little while now but this thought just crossed my mind the other day. And even some E85 faqs too. Shoot all of your knowledge my way, my brain is a sponge right now.